[Elecraft] K4 bandpass filters?

[Nr4c]

The K4D has s second ADC and therefore must have the band pass filters identical to the existing ADC use for the main two receivers in the base K4. 

Sent from my iPhone
...nr4c. bill


> On May 19, 2019, at 11:51 PM, Bill Frantz <frantz at pwpconsult.com> wrote:
> 
> In the K4HD model, there are two crystal filters, one for CW and one for SSB. These radios are designed for strong nearby signals, as might occur on a DXpedition, where there are several stations operating on the same band.
> 
> I wonder if the "SSB" filter is wide enough for running Fox/Hound FT8 in Fox mode. There you really want a bandwidth of 4K or so to copy all the callers.
> 
> On the other hand, you may want narrower when running SSB. It is possible that the DSP filter can handle that situation since you can plan the transmit frequencies to be at least 4KHz apart.
> 
> 73 Bill AE6JV
> 
>> On 5/19/19 at 4:10 PM, jtmiller47 at gmail.com (Jim Miller) wrote:
>> 
>> Eric mentions bandpass filters in his interview and the description of the K4D mentions a second set of those.
>> I wonder how those are configured?
>> Are they always active? Do they permit general coverage operation?
>> 
>> Jim ab3cv
> 
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